Lock.



A. TARASZIR.

LOCK.

APPLIOATION FILED JULY 28,1913

Patented July 7, 19145 mm NM Wilt M24200 THE NORRIS PETERS CO. PHOTO-LITHQ. WASHINGTON, D, C

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ANDREW .TARASZIR, OF NEW YORK, N. Y.

LOCK.

To all whom it may concern:

lie it known that I, ANDREW TARAszm, a subject of the Emperor of Austria-Hungary, and a resident of New York city, in the county of New York and State of New York, have invented certain new and useful Improvements in Locks, of which the followingis a specification.

This invention relates to locks and has for its principal object to provide a lock which cannot be tampered with by unauthorized persons.

Another object is to provide a lock of this character which can be opened from within without the use of a key.

Still further objects and advantages will appear more fully from the detailed description and the features of novelty will be particularly pointed out in the claims.

In the drawing illustrating this invention, Figure 1 is a cross sectional view of my improved lock, the section being taken ap proximately on line 11 of Fig. 2. Fig. 2 is an interior view of the lock partly in section. Fig. 3 is an interior view of the lock on a reduced scale. Fig. {l is a detail of the novel key I employ.

The keyhole of the lock is of a diameter which is too small to receive a key having the ordinary form of bit. The improved key which is provided is made in two sections pivotally connected, the bit of the key being capable of being turned into aline ment with the stem to be inserted into the very small opening through the door. The bit may then be allowed to swing down as by gravity to engage a member connected to the holding pin to disengage the same from the bolt the bit thereupon engaging a projection on the bolt to move the latter inward, and thus perform the unlocking oper-. ation. The barriers or wards are disposed beyond the outermost surface of the keyhole and register with the bit when the latter is swung down after insertion.

Referring more particularly to the drawings, the door 10 is formed with a small, circular keyhole 11, corresponding to the diameter or width of the stem 12 of the key. The bit 13 of the key is hinged to the stem as at 14k and may be turned into alinement therewith to be inserted through the keyhole 11. The bit is held from movement past the position of alinement by a pin 15. When the key is turned so thatthe slots in Specification of Letters Patent.

Application filed. July 28, 1913.

Patented July '7, 1914:.

Serial No. 781,691.

the bit, hereinafter described, open upward, the tail portion 16 of the pivoted hit is held by the pin 14:, and thus preserves the alineinont during the process of insertion of the key. After the latter is so inserted, it is turned 180 into the position indicated in dotted lines in Fig. 1, thus allowing the bit to fall by gravity. The latter is then readily pulled into the interior of the lock through the slot 17 formed in the casing 18, fastened to the interior of the door and which incloses the moving parts of the lock, the key then assuming the position shown in solid lines in Fig. 1. a

The belt 19 is mounted to slide within a casing and is impelled outward by a spring 20, one end of the spring abutting the interior of the casing and the other end hearing against the interior wall of a socket formed in the bolt. A pin 21 is slidably mounted in the wall 22 of the casing, inclosiug the bolt and is normally held in engagement within sockets 23 and 24 formed in the bolt corresponding to the locked and unlocked position of the latter. This pin is impelled toward the bolt by a spring 26 hearing against a lever 25 pivoted to the lVhen the key bit is turned into the slot 17, assuming the position shown in. solid lines in Fig. 1, it engages the lever 25, so that when the keyis turned, the lever 25 's turned about its fulcrum to lift the pin 21 out of engagement with the bolt. llurther rotation of the key brings the end of its bit 13 into engagement with a projection 27 extending from the bolt, thus forcing the latter inward against the tension of the spring 20, until the lever is released by reason of the overtravel of the bit past the same, and the pin 21 then snaps into the socket 23 to hold the bolt in retracted position, and so unlocking the door.

To adapt the lock for operation only by a particular key specially made for the same, I provide a series of barriers or wards over which the particular key freely passes, but which effectually prevent any other key from passing, even though it may be of the same general hinged construction as my improved key. These barriers are in the form of segmental ridges 30 and 31, substantially concentric with the axis of rotation of the key and preferably secured to the interior plate 28 of the casing. The bit 13 is formed with slots 31 and 32 for clearing the barrier 30 and with a slot 33 for clearing the barrier 31. A slot 34 is also formed for passing over the lever 25, the wall of this slotsorving as an abutment for actuating the lever to release the pin when the key is turned. It will be readily seen that any number of these barriers may be used in diiierent locks of this character and they may be spaced at various distances from the axis of rotation of the key, and thus a key fitting one look will not fit any other lock. After unlocking the door, the key may be removed by first turning it into position in which the bit is in alinement with the slot 17, shoving the key inward until the bit passes through the slot and then turning the key into the position illustrated in dotted lines in Fig. 1, with the bit turned upward. The latter will then drop into a position of alinement with the stem, whereupon the key may be readily pulled out. For locking the door from without, the key is inserted as previously described and is turned sulhciently to disengage the pin from the bolt. The impelling spring thereupon projects the bolt into locking position. For locking and unlocking the lock from within without the aid of a key, I have provided a small lever 35, pivoted to the pin 21 and extending out of the casing through a slot 36. When this lever is pulled down, it fulcrums against the lower wall of the slot 36, thus raising the pin 21 and releasing the bolt. The latter is then projected by the spring or it it is in projected position, it may be retracted by means of a fin ger piece 37 which may be secured to the bottom of the pin or projection 27 which may pass through a slot 38 formed at the bottom of the bolt casing. It will thus be seen that l have provided a lock of a novel construction with the mechanism so arranged that it can be opened only by a spe cial form of key, and thus the picking of the lock with skeleton keys by unauthorized persons is made impossible. Also by properly designing the relative heights of the barriers, the length of the lever 25 and the relative position of the projection 27, it is made very difficult, if not impossible for any one to discover the proper proportions for the key, even should he understand the general principle upon which this look is constructed.

Having thus described my invention, 1 claim as new and desire to secure by Letters Patent:

1. In a look, a keyhole, a barrier within the lock and partially encircling the keyhole and adapted to serve as an arcuate guideway for the butt end of the key, a bolt, means for holding the bolt in projected position, a pivoted member connecting said means adapted for engagement by the key to release the bolt, and an elongated projection extending from the bolt adapted to be engaged by the key after the holding means has been disengaged from the bolt to retract the latter from its projected position.

2. in a lock, a keyhole, a plurality of seg- 7 key bit may pass, a socket having a slot in a longitudinal side thereof within the casing,

' a bolt adapted to reciprocate in said socket,

a projection extending from the bolt through said slot, a pin engaging the bolt, a member adapted to be operated by the key to disengage the pin from the bolt, said projection geilng also engaged by the key to retract the 4. A lock having a casing, a keyhole, a

barrier at the interior of the lock disposed laterally of the keyhole, a bolt, means for engaging the bolt to hold the same in projected position, a member engaged by the key for retracting said holding means, said member being disposed at a greater distance from the axis of the keyhole than the outermost surface of the latter, and means for operating the lock from the inside comprising a lever connected to said engaging means and passing through the casing whereby said means may be retracted, and a finger piece extending from the bolt to the exterior of the casing whereby the bolt may be retracted when the engaging means has been released by the lever.

5. In a look, a bolt, a spring for projecting the bolt, a pin for holding the bolt in, projected and retracted positions, a projection extending from the bolt disposed to be engaged by the key after the pin is disengaged from the bolt for retracting the latter, said pin being also disengaged for projecting the bolt with a movement of the key in the same direction as for retracting the bolt.

6. In combination with a lock having a keyhole of comparatively small diameter, a lock casing, a barrier within the casing partially encircling the keyhole, a bolt, means for holding the bolt in projected position, a member connected to said means disposed also at a greater distance from the axis of the keyhole than the outermost surface thereof, of a key comprising a shank, a bit hinged thereto at a distance from its end greater than the radius of the keyhole, said bit being swung into a position of alinement with the shank for insertion through the keyhole and swungto a position transverse to the shank for engagement with said member and bolt to release the latter and retract the same the portion of the bit adjacent the hinge being provided with notches to clear the barrier.

7. In combination with a lock provided with a keyhole, a casingfor the mechanism of the lock formed with an elongated slot, a barrier within the casingdisposed at a greater distance from the axis of the keyhole than the outermost surface of the keyhole and adapted to serve as an arcuate guideway for the butt end of the key, a bolt, means for engagingthe bolt to hold the same in projected position, a pivoted member connected to said means adapted to be operated by the key, said member being also disposed at a greater distance from the axis of the keyhole than the outermost surface of the latter, of a key having a stem, and a bit hinged thereto at a distance from its end greater than the radius of the keyhole said bit being swung in position of alinement with the stem for insertion through the keyhole and past the slot in the casing, the bit being adapted to be swung into a position transverse to the stem and to be pulled within the casing through the elongated slot to engage said member to disengage the holding means and to retract the bolt, the portion of the bit projecting beyond the hinge serving to prevent the key from being pulled out of the casing.

8. In combination with a lock provided with a keyhole, a casing for the mechanism i of the lock formed with an elongated slot, a barrier within the casing disposed at a greater distance from the axis of the keyhole than the outermost surface of the latter, and adapted to serve as an arcuate guidcway for the butt end of the key, a bolt, means for engaging the bolt to hold the same in projected position, a pivoted member connected to said means adapted to be operated by the key, said member being also disposed at a greater distance from the axis of the keyhole than the outermost surface of the keyhole, of a key having a stem, and a bit hinged thereto at a distance from its end greater than the radius of the keyhole, said bit being swungin position of alinement with the stem for insertion through the keyhole and past the slot in the casing, the bit being adapted to be swung into a position transverse to the stem and to be pulled within the casing through the elongated slot to engage said member to disengage the holding means and to retract the bolt, the bit being formed with a slot to clear the barrier, the portion of the bit projecting beyond the keyhole serving to prevent the key from being pulled out of the keyhole when the key is drawn into the casing.

Signed at New York city, in the county of New York and State of New York, this 23rd day of July, 1913.

ANDREW TARASZIR.

Witnesses Gnonen DUNN, RUDOLF Szvonoor.

Copies of, this patent may be obtained for five cents eachyby addressing the Commissioner of Patents,

Washington, D. G. 

